Overview We are building a production-grade AI-integrated platform that generates milestone plans from user-defined outcomes, tracks progress, and adjusts plans using deterministic logic. This system is not a typical chatbot. Core reasoning and decision logic are implemented deterministically in code, while AI APIs are used strictly for structured parsing and natural language generation. The full functional specification, architecture design, database schema, and build guide are complete. We need a senior engineer to implement the system. Scope of Work You will build: Backend • Node.js / Express API • PostgreSQL database implementation • Plan generation engine • Dependency resolution logic • State machine and lifecycle management • Plan versioning system AI Integration • Claude or equivalent LLM API integration • Structured parsing system • Prompt construction and validation framework Infrastructure • Authentication • Notification systems • Data persistence • Telemetry and logging Required Skills Must have strong experience in: • Node.js • PostgreSQL • REST API development • AI API integration (Claude, OpenAI, etc.) • Backend architecture Strongly preferred: • TypeScript • SaaS platform experience • Workflow or orchestration systems • State machine implementation Deliverables • Fully functional backend system • Database implementation • AI integration layer • Plan generation engine • Production-ready APIs Project Status • Functional specification complete • Architecture complete • Ready for development To Apply Please include: • Relevant systems you've built • AI integration experience • GitHub or portfolio • Brief description of your architecture experience